A constant is a constant. To declare constants in the C++ programming language, const using the helper keyword ( We declare this variable as immutable). A constant can only read (get) its value.
# include <iostream>
using namespace std; int
main () {
const int n = 13 ; // _the value of n is always equal to 13; _return 0 ;
}
Let's look at the impossible.
# include <iostream>
using namespace std; int
main () {
const int n = 13 ; // the value of n is always equal to 13
n = 15 ; // error: n is read-only here
cout << n; return 0 ;
}
2nd line : the C++ compiler will not allow such a case where an attempt is made to change the variable. and will give you the above error screen. Be careful when declaring a constant because this identifier cannot be changed during program execution and you will get an error if you try to change it.
A variable of an optional type can be declared as a constant when declaring a constant.
#include <iostream>
using namespace std ; int
main () {
const int age = 24 ; // age (age) constant const string name = "MasterSherkulov" ; // name (name) constant const bool is_developer = true ; // is_developer (developer) constant const char is_char = 'M' ; // is_char constant const float PI = 3.14 ;
}
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